Pilot burner



Patented Dec. 18, 1951 PILOT BURNER Harold B. Donlem Columbus, Ohio, assignor to Columbus Metal Products, Inc., Columbus, Ohio, a corporation oriohio V I Application October 11, 1947, Serial No. 779,358

lclaim. (c1.15s-91) This invention relates to a pilot burner, and.

particularly to a pilot burner suitable for use with a burner. In the particular form here shown the pilot burner is applied to a liquid fuel burner.

Another object of this invention is to provide a. pilot burner suitable for use with the so-called pot type burner.

A further object is to provide a pilot burner of the type indicated which is permanently located within the pot or main burner and which burner illustrating the pot in plan View and taken at line 2-2 of Figure l;

Figure 3 is a horizontal section taken at line 3-3 of Figure 1. a

Like parts are indicated by like characters in the specification and drawings.

As shown, the burner comprises an outer wall or jacket lwhich may be closed at its bottomby' a member 2 provided with an opening 3.- A burner pot 4 i positioned within the member I and is supported on a ledge 5 fixed to the member I. A flame plate 6 may be positioned over the pot 4. This plate is provided with an opening 1 and may have a centering annular enlargement 8. The pot 4 is provided with one or more groups or rows of perforations 9 positioned in its walls, and with a row or group of upwardly inclined perforations Ill positioned toward its upper edge. The pot 4 is closed by a plate or member I I which, as shown, is integral with the remainder of the member 4. The member 4 may be provided with a lateral flange l2 which rests upon the ledge 5 and beneath the flame ring 6. A fuel inlet 13 is formed of a pipe or conduit which conducts fuel from any source to the interior ofthe pilot and thence to the interior of the pot.

The pilot burner comprises a wall-like member [4 which is open at its bottom and closed generally at its top. An outlet or flame opening |5a is provided in the upper edge 15 or toward the top of the burner wall l4. One or more the bottom of the wail Preferably, although.

not necessarily. the pilot housing or wall I4 is provided with an open bottom-which is closed by the floor or bottom ll of the pot 4. The fuel enters through the conduit. or pipe l3 which may be connected, .to a nipple I1 fixed to the pot wall 4.

Formed preferably integrally with the pilot wall I5 is a downwardly curved member 18 whichv 1. is provided with a row or group of perfora- 15 itself.

tions l9.

A cover member 20 is fixed to the member I5. It is generally annular in plan. as shown: in Figure 2, and provides an air passage or conduit 2| within If desired. the top of. the member l5 may be provided with a rounded a'rcuatedepression 22 which forms apart of the wall of the, passage 2!. I About the opening lSa the member 20 is provided with a group or row of perforations 23. The cover member "may, if desired. be upwardly enlarged as at 24 in register with a nipple 25 into which an air conduit or pipe 26 is threaded. That is. an air inlet is provided 1 for the pilot separate from the air inlets provided for the mainpot.

It will be realized that although I have illustrated and described an operative device. still many changes may be made without departing materially from the spirit of my invention, and I I wish, therefore, that. my showing be taken as in a broad sense illustrative and diagrammatic rather than limiting me to my precise showing.

The use and operation of this invention are as follows:

In the particular form here shown, the pilot burner is mounted within a pot type burner. This burner itself may be mounted in many different sorts of housings and associations. The one shown herewith is merely typical of such mountings. Air for the main pot 4 enters through the opening 3 in the plate 2 and passes upwardly about the space bounded by the members i and 4. This air passes inwardly through the openings 9 and may be considered the primary air. It mixes with liquid fuel present in the pot 4 and causes a primary vaporization. This results in a rich mixture which rises and into which secondary air is discharged through the upwardly inclined openings or perforations Ill. whens sufficient fuel is present, combustion occurs in the pot 4 above the bottom, and final combustion occurs toward the top of the pot. The flame produced may extend upwardly through the opening 1.

notches or openings l6 are provided in or near ll Fuel for combustion is supplied through the light. When that is the case, a limited quantity of fuel is discharged through the conduit l3; to. I

the interior of the pilot housing 14. Some air reaches this housing throug'h the openings I9," and primary vaporization of"-the"fuel' occurs within the housing l4. As the rich mixture thus formed rises, secondary air isdischarged into it, through the openings or perforations 23. This air enters from the conduit 26 and passes through the cavity 2| and the openings 23. This rich mixtureisignited and .burns toward the top of the :pilotassembly and normally creates a flame extending .outwardly' above the member 2!]. Under-normal conditions of pilot operation, when only'the'pilo't is to burn, only enough fuel will be supplied through'the conduit l3 to support combustion in and about the pilot.

When. it is desired to ignite the-burner as a whole, the amount of fuel which is supplied through the" conduit [3 will be increased; Com- After general burning, when it is desired to shut' 'oifth e main' burnenbut to continue thepilot .in""-'operation, the' ''quantity of fuel being introduced through the conduit [3 will be reduped-to the-point at which combustion in and above thepihit"can alone be supported. The pilot will: then'co'ntinue to burn, using a mini-' mum offuel and" supporting a'small amountof combustion which producesa flame available for immediately" lighting the entire: burner as a whole whenever the quantity of fuel fed through the conduit. I3 is sufliciently increased.

I claim:

For use in a burner having a pot which in- 5 cludes a bottom wall and a side wall, a generally imperforate walled pilot structure adapted to be positioned within the pot, said pilot structure including side and top wall portions having edges adapted to contact the side and bottom" walls of the pot and to define, with the side and bottom 'walls of the .pot, a mixing chamber adapted to receive the liquid fuel supply of the pot, said pilot structure including an upper wall portion adapted to define with the pot side wall and the toplwallporti'on of the mixing chamber a plenum chamber above'the mixing chamber, said plenum .chamber-being outwardly open and adapted to receive air through the pot side wall, the top wall of the mixing chamber being provided with 20 a flame aperture, the wall portions of the pilot structure including an annular wall portion surrounding the flame aperture and extending therefrom-upwardly through the plenum chamber, said pilot structure being formed adjacent its lower edge to permit the flow of unvaporized liquid-fuel from the mixing chamber into the interior of the burner, the annular wall portion which surrounds the flame aperture being provide'd 'with'small air apertures in communicatio'n"with the" plenum chamber, formed and adapted to direct air upwardly about a mixture flowing upwardly from the mixing chamber through theflame aperture, the top wall portion M of the mixing chamber having air outlets adapted 353 to' permit air to flow from the interior of the plenum chamber into the interior of the mixing chamber.

HAROLD B. DONLEY.

40: 1REFERENCES CITED The following references. are of record in the Huston .et'al. Jan. 25, 1949" 

